Hi guys,
I've just started a new project and thought I'd post it here. I bought an old Kikusui oscilloscope, "spares or repair" from e-bay. Actually I wasn't after a scope, I was after a couple of beefy linear power supplies, from the same seller (also "spares or repair",) but they went for far too much money!!!!! (This was a collection only item, so I got a chance to speak to the seller. He was buying and selling audio gear, and told me that the scope was part of job lot he'd bought when a repair shop had closed down.)
As a consolation prize I won this:-
Uh-Ohh, Two missing knobs.......... Two missing buttons.......... And three missing lever knob ends!!!!!! Yikes!
Anyway it came with a power lead, so I powered it up and waited for the magic smoke......
Nothing, nada, nicks..... No trace, no lights, no smoke, nothing.
Ahh Hah, must be a fuse.... No, the fuses are OK.
OK, let's open this sucker up. Nine screws later and Tah-dah....
UH OHHH What's this:-
Pretty catastrophic failure, I wonder what caused it? Anyway I've had the scope for a few weeks, and had already tracked down a service manual.Also tucked away inside, under the CRT was some hidden treasure.... most of the missing hardware from the front panel and the burned out components.Looks like some heart bypass surgery is needed!!!!!!!!!
The top board had already been removed at some point, you can probably see the board to board connectors are lying all over the place in the case open picture. All I had to do was unscrew the shielding can. pop the plastic rivets that held the board to the chassis, and lift it out.
Now we get a better idea of what needs to be done!
Ok, so I've seen this kind of repair before (on one of those Pace soldering videos on 'you-tube'.)
I need to cut back the damaged PCB until I find sound fibre-glass, make a new section to match and then patch it in with epoxy resin, and solder bridge the tracks.
I've just started a new project and thought I'd post it here. I bought an old Kikusui oscilloscope, "spares or repair" from e-bay. Actually I wasn't after a scope, I was after a couple of beefy linear power supplies, from the same seller (also "spares or repair",) but they went for far too much money!!!!! (This was a collection only item, so I got a chance to speak to the seller. He was buying and selling audio gear, and told me that the scope was part of job lot he'd bought when a repair shop had closed down.)
As a consolation prize I won this:-
Uh-Ohh, Two missing knobs.......... Two missing buttons.......... And three missing lever knob ends!!!!!! Yikes!
Anyway it came with a power lead, so I powered it up and waited for the magic smoke......
Nothing, nada, nicks..... No trace, no lights, no smoke, nothing.
Ahh Hah, must be a fuse.... No, the fuses are OK.
OK, let's open this sucker up. Nine screws later and Tah-dah....
UH OHHH What's this:-
Pretty catastrophic failure, I wonder what caused it? Anyway I've had the scope for a few weeks, and had already tracked down a service manual.Also tucked away inside, under the CRT was some hidden treasure.... most of the missing hardware from the front panel and the burned out components.Looks like some heart bypass surgery is needed!!!!!!!!!
The top board had already been removed at some point, you can probably see the board to board connectors are lying all over the place in the case open picture. All I had to do was unscrew the shielding can. pop the plastic rivets that held the board to the chassis, and lift it out.
Now we get a better idea of what needs to be done!
Ok, so I've seen this kind of repair before (on one of those Pace soldering videos on 'you-tube'.)
I need to cut back the damaged PCB until I find sound fibre-glass, make a new section to match and then patch it in with epoxy resin, and solder bridge the tracks.
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